A heat pipe includes a hollow metal casing. The system in its preferred embodiment provides an invasive combined electrophysiology and imaging antenna catheter which includes an RF antenna for receiving magnetic resonance signals and diagnostic electrodes for receiving electrical potentials. Alternatively, the same control commands may also be fed to all the plate cylinders involved in printing, in order to carry out a desired continuous or stepwise adjustment of the cylinders in the lateral direction andor the circumferential direction. A first collar and a second collar, between which a limited free path of the displaceable assembly unit is defined, form end stops in the cavity of the housing. The membrane has pores with a size smaller than any of the sample pores. The method further includes, in response to the altered print job being performed instead of the original print job, storing details of a cost saving associated with performing the altered print job instead of the original print job.